This document examines three important national surveys that provide periodic longitudinal data on the transition to adulthood during the late 1960s and 1970s: (1) the Parnes Young Men and Women Panels, initiated in 1966 and 1968; (2) the Panel Study of Income Dynamics, initiated in 1968; and (3) the National Longitudinal Study of the High School Class of 1972. Section I of this paper provides an introduction to the three datasets and describes two projects in the Rand Corporation Labor and Population Program which build on the complementarities of these datasets. Section II outlines the special characteristics of each survey that affect the construction of appropriate cohorts for comparison and compares them on such background characteristics as age at survey, race and parental education. Section III presents the constructions of the four measures of life-cycle progress: first marriage, leaving the parental home, school enrollment, and military service. Section IV shows how the four measures compare across surveys. Section V discusses the results and their implications for the complementary use of these datasets and for the prospective collection of information on life-cycle transitions. Background tables are appended and references are given. (NRB)